PEmicro’s debug configuration allows user to modify JTAG communication shift frequency between debug interface and the target. By default, this frequency is set to a maximum value of 5000KHz, to take advantage of the fastest run control and FLASH programming experience:
At the same time, not every PowerPC processor might be able to support highest debug shift frequencies with all PEmicro debug interfaces. For example, debug frequency for MPC5634M board used in conjunction with Multilink Universal FX RevC , needs to be lowered to 4000Khz in order to succeed. Hence, if debug session fails to successfully start up or fails on FLASH programming, lowering a debug shift frequency by a factor of 2 or 4 is the first trouble shooting recommendation.
To get to PEmicro’s debug configuration window, one should select “Debug Configuration” from the menu next to a debug icon, and switch over to the Debug tab, within “Debug Configuration” menu pop- up.